Home / 9,121.36-12,587.52-5,142.64

Finding the Fourth Proportional to 9,121.36, 12,587.52 and 5,142.64

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Solution

The fourth proportional to 9,121.36, 12,587.52 and 5,142.64 is: 7,096.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.36 : 12,587.52 = 5,142.64 : x
  2. Step 2: Convert to fraction form
    9,121.36/12,587.52 = 5,142.64/x
  3. Step 3: Cross multiply
    9,121.36x = 12,587.52 × 5,142.64
  4. Step 4: Simplify right side
    9,121.36x = 64,733,083.85
  5. Step 5: Solve for x
    x = 64,733,083.85/9,121.36
  6. Step 6: Final answer
    x = 7,096.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.